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View Full Version : My first Mini-z buildup - MR-02 Enzo


JeremyC
2009.08.24, 10:11 PM
I am completely new to Mini-z's, and have never seriously raced RC cars before. Since I have played with RC cars for years, and love to tinker; I figured this thread would be a fun way to show the car as it evolves into a stock racer.

This car was bought used, and my first run showed that the car works just fine. I am not entirely happy with the antenna, and plan on changing that so that it is a little better in form and function.

Note that the car didn't come with the stock rear shock; it did come with a carbon H-plate though. I am not worried about this right now, but I am going to want to get one of these before too long.

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4744.jpg

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4745.jpg

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4746.jpg

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4747.jpg

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4748.jpg

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4749.jpg

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4750.jpg

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4751.jpg

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4752.jpg

JeremyC
2009.08.24, 10:12 PM
http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4753.jpg

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4754.jpg

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4755.jpg

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4756.jpg

http://jeremychase.net/~jeremy/images/Miniz/FirstNight/IMG_4757.jpg

EMU
2009.08.24, 11:24 PM
Looks like its in good shape... I would keep the antenna that is on it, should be better than most others you could switch it to.

herman
2009.08.25, 12:27 AM
congratulations.... you are now a proud new owner of a grand spanking red enzo ferrari...
:D

bermbuster
2009.08.26, 08:42 AM
nice looking ride.....
now you really only need tires and tire tape to start racing.
Kyosho 20s in the rear and Kyosho 30s in the front.

Using the stock mm mount will limit your choices right now for top shock/damper plates....look at the big picture before you buy. You maybe buying some parts twice.....Look at some of the racers set ups before you decide on what and how.....

bigmike17
2009.08.26, 11:33 AM
Sweet looking car for a first effort. Have fun racing.:)

JeremyC
2009.08.26, 02:02 PM
Last night I headed up to NYRC and had a lot of fun. Before I even put the car on the track I grabbed some tires. Willy picked these out for me, and they felt really good, and I didn't have any traction problems.

http://mini-zracer.com/forums/attachment.php?attachmentid=27919&stc=1&d=1251313017

I did a couple runs on the stock bushings, but I had my eye on some bearings. I grabbed those and installed them at about 9:30. The car was noticeably quicker, and everything seems much tighter. With the bushings the rear axle was quite loose, and when I reversed I think the gears were slipping a bit. With the bearings it is nice and tight with no slip.

http://mini-zracer.com/forums/attachment.php?attachmentid=27920&stc=1&d=1251313017

JeremyC
2009.08.26, 02:11 PM
Looks like its in good shape... I would keep the antenna that is on it, should be better than most others you could switch it to.

The antenna performed quite well at the track; I didn't have any glitching problems unless the batteries in my car were very low.

congratulations.... you are now a proud new owner of a grand spanking red enzo ferrari...
:D
:D
Sweet looking car for a first effort. Have fun racing.:)
:)
nice looking ride.....
now you really only need tires and tire tape to start racing.
Kyosho 20s in the rear and Kyosho 30s in the front.

Using the stock mm mount will limit your choices right now for top shock/damper plates....look at the big picture before you buy. You maybe buying some parts twice.....Look at some of the racers set ups before you decide on what and how.....

Tire tape.. I just stuck those Atomic's on there. After running all night the tires hadn't shifted too much. I'll need to get some though.

I'm not entirely sure what to do for a damper. I ran the car all night with just the odd H-Plate (see previous images), and it ran ok. Willy at NYRC said that the plate was stiff enough that I could run it that way. In practice the car felt pretty good on course, so I'm inclined to run it this way for a bit. When I figure out a good system I'll jump to it.

JeremyC
2009.08.26, 07:58 PM
I took my kingpins out, and polished them. They actually fit into the chuck on my dremel, and I used a very non-abrasive metal polish. After about a minute on the slowest speed setting the king pin looked pretty good.

Left is before, right is after.

http://mini-zracer.com/forums/attachment.php?attachmentid=27925&stc=1&d=1251334690

bermbuster
2009.08.26, 08:18 PM
Tire tape.. I just stuck those Atomic's on there. After running all night the tires hadn't shifted too much. I'll need to get some though.

in the beginning you drive slower and the tires stay on the rims.....
once your tires start scrubbing they either fly off or fly in causing your car to act weird....
using tape is a given unless you use glue.....:D

Scrapper
2009.08.26, 08:34 PM
that car looked good for pretty much box stock yesterday

JeremyC
2009.08.26, 09:17 PM
I noticed that the inside rear tire was spinning frequently coming out of turns. I saw some posts about putting some grease in the diff to stiffen it up. Now when I spin the diff by hand it feels a lot less 'free spinning'. The only thing I was watching out for was the diff being too stiff and causing the rear to slide; which didn't happen on the hardwood so I think on RCP it'll be just fine.

http://mini-zracer.com/forums/attachment.php?attachmentid=27926&stc=1&d=1251339419

in the beginning you drive slower and the tires stay on the rims.....
once your tires start scrubbing they either fly off or fly in causing your car to act weird....
using tape is a given unless you use glue.....:D
If that is the case I hope my wheels start flying off sooner rather than later. :)

that car looked good for pretty much box stock yesterday
When I got lucky and strung some turns together the car scooted.. If only there weren't any walls to hit :)

JeremyC
2009.09.08, 06:14 AM
Well I have done a lot with the car that I haven't mentioned, so here we go:


Changed the bump stop from 5.0 to 4.5, the 4.0's seemed like they might rub
Removed a burr from the left end of the axle shaft. This burr caused the left drive wheel to go on slightly crooked, and when spinning the wheel would vibrate
Superglued the window glass in... twice.
Removed Wiper blade from body
Got a set of Orion 900's
Took the KT-2 apart and regreased the throttle(much smoother now), and softened the spring for the steering wheel(it was *really* tight before)
Disassembled the stock motor, cleaned, put back together. Mostly did this to learn about motors.


I also cleaned the steering servo for the first time. I didn't have any trouble taking it apart and putting it back together, but fitting the wires back into the chassis is a pain. Getting it all to sit just right was my challenge, and I even broke a solder joint to the servo motor wire. That was annoying, but quickly fixed with the soldering iron.

Before:
http://mini-zracer.com/forums/attachment.php?attachmentid=28031&stc=1&d=1252407799

After:
http://mini-zracer.com/forums/attachment.php?attachmentid=28032&stc=1&d=1252407799

Covering holes in the pot:
http://mini-zracer.com/forums/attachment.php?attachmentid=28033&stc=1&d=1252407881

Oh yah, also got another set of crystals:
http://mini-zracer.com/forums/attachment.php?attachmentid=28034&stc=1&d=1252407980

After having the car for some time I have realized that I have to disassemble, clean, and reassemble this thing a lot. These cars are so small that it is just really important.

bermbuster
2009.09.12, 10:25 PM
so far are you satisfied with your mini z ???

JeremyC
2009.09.12, 11:22 PM
so far are you satisfied with your mini z ???

In short, yes, I am very happy with the car.

I've done a few more things with the car that I aren't in the thread yet.. Need to take some photos and put them up.


PN LCG Motor mount
Atomic disk damper
70 turn motor, I believe it is the PN Stock, but it doesn't have markings on it.
Got an atomic FRP H-plate set, running medium
Lowered the body clips ~1mm to raise the body, to compensate for the lowered ride height from the motor mount
Made a pretty good size wing out of clear plastic.


I ran the car at NYRC today, and it is starting to run pretty well. The car itself is handling very well, and my skills driving it are getting better. Today was the first time it felt like I was really running with the other cars, rather than just getting passed :)

The wing made a really big difference in stability; it was a dramatic change in how the car ran.

The Atomic 30 front tires seem to be letting go (after 3 days at the track). The last 30 minutes or so the car was pushing a lot more than it had been; not sure if I want to replace them with 30s again or try 40s.

JeremyC
2009.09.13, 08:57 PM
Here are photos of lowering the body clips, in order to raise the body. With the motor mount and '1' bearing adapter the body is just about at stock ride height now.

How I got the body to stay still:
http://mini-zracer.com/forums/attachment.php?attachmentid=28072&stc=1&d=1252893324

I used some small nails as spacers:
http://mini-zracer.com/forums/attachment.php?attachmentid=28073&stc=1&d=1252893324

The final clip:
http://mini-zracer.com/forums/attachment.php?attachmentid=28074&stc=1&d=1252893324

The ride height depends on droop, but if there is minimal droop, it is about stock ride height.

JeremyC
2009.09.13, 09:09 PM
More pictures of what is going on with my setup.... Sorry I can't post more than 5 per post!

Spoiler* made out of discarded clear plastic:
http://mini-zracer.com/forums/attachment.php?attachmentid=28075&stc=1&d=1252893852

Atomic 30 fronts. Note more wear on left front tire (in right of photo) due to clockwise track.
http://mini-zracer.com/forums/attachment.php?attachmentid=28076&stc=1&d=1252893852

Atomic 8 rears hardly look phased. I'm guessing because I'm a new driver.
http://mini-zracer.com/forums/attachment.php?attachmentid=28077&stc=1&d=1252893852

PN Racing V1 LCG motor mount. Thank you Glen!!! Also there is a 70 turn motor in there, also thanks to Glen's donation :)
http://mini-zracer.com/forums/attachment.php?attachmentid=28078&stc=1&d=1252893852

Atomic damper system, again, thank you Glen and John for the parts!
http://mini-zracer.com/forums/attachment.php?attachmentid=28079&stc=1&d=1252893852

JeremyC
2009.09.13, 09:19 PM
A little bit about the battery charging system I have right now.

Standard 30 min Duracell charger. Does 1.7A for AAA's. I haven't used my Orions in this yet.
http://mini-zracer.com/forums/attachment.php?attachmentid=28080&stc=1&d=1252894399

I have one set now, and have 2 more in the mail.
http://mini-zracer.com/forums/attachment.php?attachmentid=28081&stc=1&d=1252894399

A random set of ECOtrends batteries that I have been using. They are not as fast as the Orions, but for me they are good for practice.
http://mini-zracer.com/forums/attachment.php?attachmentid=28082&stc=1&d=1252894399

An energizer charger that I had before Mini-z'ing.
http://mini-zracer.com/forums/attachment.php?attachmentid=28083&stc=1&d=1252894399

It is a pair charger that does a fair 450ma
http://mini-zracer.com/forums/attachment.php?attachmentid=28084&stc=1&d=1252894399

JeremyC
2009.09.13, 09:25 PM
Before I forget, I had a problem with ride height when I started using the PN LCG mount. The thread is here: http://mini-zracer.com/forums/showthread.php?t=32580

Some body clearancing I did. (I have done a little more since this was taken)
http://mini-zracer.com/forums/attachment.php?attachmentid=28042&stc=1&d=1252410291

I got a set of Atomic FRP H-Plates. Currently running the Medium plate with good luck.
http://mini-zracer.com/forums/attachment.php?attachmentid=28085&stc=1&d=1252894970

Bought a Core Networks RFID card so I can see how fast I am going.
http://mini-zracer.com/forums/attachment.php?attachmentid=28086&stc=1&d=1252894991

JeremyC
2009.09.20, 09:17 PM
Both of these are 30 degree Atomic radials. The 'slicks' have 4 days of wear.

http://mini-zracer.com/forums/attachment.php?attachmentid=28150&stc=1&d=1253499307

JeremyC
2009.09.28, 01:24 PM
Should I continue this thread? Does anyone read it?

Skv012a
2009.09.28, 01:37 PM
If you can, make some vids of this in action.

EMU
2009.09.28, 01:38 PM
More people read than write... I am sure that this information will be very helpful to new racers. The car is looking good ;)

Traveler
2009.09.28, 02:03 PM
Keep up the good work!

JeremyC
2009.09.28, 02:31 PM
I noticed that the inside rear tire was spinning frequently coming out of turns. I saw some posts about putting some grease in the diff to stiffen it up. Now when I spin the diff by hand it feels a lot less 'free spinning'. The only thing I was watching out for was the diff being too stiff and causing the rear to slide; which didn't happen on the hardwood so I think on RCP it'll be just fine.


I am still running the gear diff, and to be honest, a ball diff is not on my radar yet. From what I've read it adds complexity and the benefits over gears aren't that dramatic.

But I'm bringing this topic back up because I've learned that the wheelspin on the inside tire was eliminated by using a much softer H-plate. When I had the wheel spin problem I was running a super stuff carbon H-plate. I am now running a medium FRP h-plate and wheel spin is no longer an issue. With the stiff plate the inside rear would lift up a lot more when cornering.

What I have found, is that over the course of 4-5 hours of track time my rear diff becomes rough. Removing and cleaning the diff has to be done at least every time I go to the track. I am going to keep the status quo on the diff, but only because I have major power updates. (otherwise I would try lighter oil)

Speaking of power.... At about 2AM on Sunday morning I upgraded my motor from the USA Spec to the ball bearing Atomic Standard motor (which is the new NYRC club race motor, for god knows what reason, it is stupidly fast for 'stock' class).

http://mini-zracer.com/forums/attachment.php?attachmentid=28202&stc=1&d=1254165584

http://mini-zracer.com/forums/attachment.php?attachmentid=28203&stc=1&d=1254165584

As you can clearly see on the packaging it says that it will work on non-modified PCB's. This is bollocks; about 15 laps after putting this in my car my forward FETs blew. Granted my AM board was running 3004 FETs, and not the more modern 3010. I am working on sourcing some 8858's.

I was ready to pack up and go home, but John suggested switching the power cables to the motor, and reversing the transmitter servo control. This worked brilliantly and for 45 minutes or so I ran the car using the reverse FET (but going forward). Of course I had no reverse, but I just had to play with the new motor. It is *much* faster than the USA Spec. Disappointingly, my lap times did not improve because my driving wasn't as smooth; at least lap times didn't go UP. :)

addicted
2009.09.28, 02:33 PM
nice updates so far!
in terms of the clips, were they easy to remove from the body without breaking anything?
got my enzo coming soon, and if not low enough will be doing the same thing! :)

JeremyC
2009.09.28, 02:55 PM
nice updates so far!
in terms of the clips, were they easy to remove from the body without breaking anything?
got my enzo coming soon, and if not low enough will be doing the same thing! :)

I didn't break anything when removing the clips. I used a small amount of acetone, let it sit, some more, sit, then very carefully starting prying the clips. The acetone did leave a white residue on the underside of the car, but this seemed to come off; be careful with this stuff as it will destroy your body if you leave it on too long.

If you never apply too much force to the clips they should remove without breakage.

I found putting the clips back in evenly to be much more challenging. As you can see I used nails to make sure the spacing was the same on both sides. If you just spot put them in I imagine it would be easy to get one clip slightly higher than the other. Since CA glue dries so fast you don't have much time to move them around..

IMHO I think I have my body mounted a little higher than it needs to be. It isn't high, but given the pod change the body is about at stock ride height.

addicted
2009.09.28, 03:09 PM
ahh ok thanks :)

JeremyC
2009.10.05, 11:03 PM
Well, I got my 8858's and I installed them as a double stack. I have photos of that but I can't get them off that camera easily, so I'm not sure if those will ever surface. Instead I'll report that the car is wickedly fast. After running at NYRC on Saturday I was pretty much blown away by how much quicker the car was with the 2x2 8858's over the 2x1 3004s. (well, 1x1 3004 :P ) Going down the straight I would say that it was one of the fastest cars on Saturday, and I don't have any fancy chargers. I suck in the infield, but am getting better.

Skv012a I meant to take some videos, but I only did one. It is kind of neat but the angle is so acute that you can't really judge the speed well. I'll iMovie that shortly just so you can see it at least.

Last week I thought it would be cool to build an airfoil style wing for more 'downforce' and less drag. I ran this last saturday and it worked reasonably well, but it didn't work as well as my first effort; which is essentially a huge spoiler. I am now running the spoiler again, but mounted it better.

Airfoil shots:
http://mini-zracer.com/forums/attachment.php?attachmentid=28260&stc=1&d=1254801593

http://mini-zracer.com/forums/attachment.php?attachmentid=28261&stc=1&d=1254801593

http://mini-zracer.com/forums/attachment.php?attachmentid=28262&stc=1&d=1254801593

Roland saw me struggling with the KT-2 controller and offered to let me borrow an AM Futaba until I upgrade to 2.4. Thanks *SO* much Roland! After about half a lap I was quicker with this controller than the KT-2. I couldn't believe how much control I didn't realize I was missing.

http://mini-zracer.com/forums/attachment.php?attachmentid=28263&stc=1&d=1254801593

http://mini-zracer.com/forums/attachment.php?attachmentid=28264&stc=1&d=1254801593

JeremyC
2009.10.05, 11:14 PM
After probably 20 hours of running the car with the plastic wheelnuts I finally lost a wheel, and got some Tamiya wheel nuts. They came in a pack of 10, and since I have extras I am not worried about losing or replacing them. :)

The new wheels are standard Atomic dish wheels, but if you look closely you may notice that the fronts are 0 offsets instead of +1. This made a noticeable improvement in steering, and I don't want to run the +1's anymore. :)

http://mini-zracer.com/forums/attachment.php?attachmentid=28265&stc=1&d=1254802117

http://mini-zracer.com/forums/attachment.php?attachmentid=28266&stc=1&d=1254802117

http://mini-zracer.com/forums/attachment.php?attachmentid=28267&stc=1&d=1254802117

And finally for this post, in order to reduce the moment of rotational inertia and decrease overall weight I removed the light buckets and rear tail light lenses. I can report that after doing this it made no noticeable difference, but it makes me feel better.

http://mini-zracer.com/forums/attachment.php?attachmentid=28268&stc=1&d=1254802377

http://mini-zracer.com/forums/attachment.php?attachmentid=28269&stc=1&d=1254802377

JeremyC
2009.10.06, 12:47 AM
Here is a video of my car going down the straight at NYRC (http://www.youtube.com/watch?v=w8AlSVeDL24).

Oliver Andre
2009.11.28, 11:06 AM
Nice thread, i like it ! :-)

addicted
2009.12.21, 01:28 PM
anymore updates Jeremy? this was a pleasure to read :)

Felix2010
2009.12.27, 04:09 PM
I finally checked out this thread, and seeing the progression in your car is really cool. Nice car too.

Good reading:D